Add an experiment for the default browser infobar on Windows 10

Add an experiment called StickyDefaultBrowserInfobar that keeps the
infobar opens as long as the user haven't made a choice in the Windows
settings or until 2 minutes elapsed, whichever come first.

BUG=576490

Review-Url: https://codereview.chromium.org/1974153002
Cr-Commit-Position: refs/heads/master@{#397451}
7 files changed